Research Papers Related to Nutrient Uptake and Nutrient Solution EC Level

• Kempen, E., Agenbag, G. A., & Deckers, S. (2017). Variations in water and macronutrient uptake of soilless tomato as affected by the nutrient solution composition. South African Journal of Plant and Soil, 34(2), 139-148.
  
  The authors showed that water uptake and nutrient uptake by tomato plants was impacted by nutrient solution concentration, as measured by electroconductivity (EC) levels. As EC increased, they reported that water uptake decreased, except when measured as water uptake per leaf area. Also, their results showed that uptake of nitrogen, phosphorus, potassium, magnesium, and sulfur increased with increasing EC, while uptake of calcium decreased. The EC range used in the study was 0.8 to 4.0 mS/cm. Nutrient proportions were shown to differ from recommendations after a few days of nutrient solution recirculation, but replenishment with an adjusted "re-use solution" decreased the magnitude of these changes.